iPhone 4s White Or Blank Display Problem Solution
Display light / Backlight not working.
You can also check the LED’s using the multimeter if you can manage without damaging the LCD flex connector.
If the newly installed LCD still shows the same problem and the LED light doesn’t light up, refer to the solution below and locate the highlighted components on the PCB board.
iPhone 4s LCD Display Problem
Trace also each connection line paths were it is being connected to a lighting section.
If any track line is missing just make a jumper.
Note: Please note that even though every solution posted on our website is tested by one or more members of our team before posting, but still we do not take any responsibility for any damage it may cause to your cell phones. Use these repairing solutions at your own risk. Thank You.